Hammer crusher

ABSTRACT

A hammer crusher having a housing within which is journaled one or more rotatable hammer shafts cooperable with an anvil and gratings, each grating including replaceable grating bars. The grating bars are accessible for replacement by being mounted on a carrier movable into and out of the housing along a substantially horizontal path and without requiring appreciable lowering of the carrier to effect its removal from the housing.

Uni-ted States Patent 1191 Greitfenstem May 28, 1974 [54] HAMMER CRUSHER1,647,183 11 1927 Leggemann 241/882 ,450,492 10 948 [75] Inventor: KarlGrelflenstem, Enmgefloh, 2,554,071 5ii951 2 4 1 2 85 Germany 2,661,15812/1953 Fogle 241/189 R Assignee: Polysius AG Neubeckum Shelton X {22]Filed: Sept- 1972 Primary Examiner-Al Lawrence Smith [2]] Appl 2 1 43Assistant ExaminerK. .1. Ramsey Attorney, Agent, or Firm-Learman &McCulloch [30] Foreign Appllcation Priority Data ABSTRACT Nov. 8, 1971Germany 7142142 A hammer crusher havmg a housing within which is 52 us.c1 241/88.4, 241/892, 241/189 R, jeurnaled one or mere rotatable hemmerShafts 1 241 2 5 A erable with an anvil and gratings, each gratinginclud- 51 Int. Cl. B02c 13/04, B020 13/26 ing replaceable grating bars-The grating bars are [58] Field of Search..... 241/882, 88.4, 89.2, 189R, eessible fer replacement y being mounted on a 241 1 9 A, 235 A riermovable into and out of the housing along a substantially horizontalpath and without requiring appre- 5 References Cited ciable lowering ofthe carrier to effect its removal UNITED STATES PATENTS 5/1924 Borton241/882 from the housing.

7 Claims, 1 Drawing Figure HAMMER CRUSHER The invention relates to ahammer crusher comprising at least one crusher shaft carrying thehammers, an anvil and a replaceable grating disposed in the lowerportion of the crusher housing.

To change the grating in known hammer crushers of the aforementionedtype the grating must first be lowered out of its assembly position andthen withdrawn in the horizontal direction beneath the crusher shaft.Due to the movement of the grating necessary in two directions such anarrangement is relatively complicated.

Another unfavorable factor is that when wear occurs of individual partsof the grating, in particular of the grating zone disposed adjacent theanvil which is subjected to the highest stress, it is generallynecessary to replace the entire grating.

The invention is therefore based on the problem of avoiding theaforementioned disadvantages and making a hammer crusher of theaforementioned type in such a manner that the removal of the grating ispossible in a very simple manner and in addition account is taken of thevarying wear of the individual grating regions.

According to the invention, this problem is solved in that the gratingis divided into a grating plate adjoining the anvil and a grating basketwhich may be withdrawn from the crusher housing in the horizontaldirection without appreciable lowering.

Conveniently, the grating plate is made only so wide that the upper edgeof the end of the grating basket adjacent the grating plate liesslightly lower than the lower edge of the hammers. In this manner, thegrating basket may without lowering be withdrawn beneath the crushershaft equipped with the hammers in the horizontal direction, after whichthe grating plate can also be removed if necessary.

The division of the grating into a relatively narrow grating plateexposed to high wear and a large grating basket also has the substantialadvantage that the grating plate can be replaced separately whencorrespondingly worn.

The solution according to the invention is suitable both forsingle-shaft hammer crushers and for doubleshaft hammer crushers.

An exemplary embodiment of the invention is illustrated in the drawing.It shows a partial cross-section (left half) through a double-shafthammer crusher according to the invention.

The double-shaft hammer crusher is made symmetrically with respect tothe vertical center axis 1 and consequently the description of the lefthalf illustrated will be sufficient. The hammer crusher contains tworotating rotors or shafts 2 which are equipped with impact members orhammers 3 and cooperate with an anvil 4 common to both shafts and agrating which consists of a grating basket 5 and a grating plate 6forming a bridge between the basket and the anvil 4.

Each grating basket 5 comprises a plurality of grating bars 7 arrangedin an are adjacent the rotary path of the hammers and which are mountedin a carriage frame 8 which may be moved with the outer housing wallmember 9 in a horizontal direction (double arrow 11) by a hydraulicdrive mechanism 10, the two baskets being movable in opposite directionsduring removal.

For this purpose, roller guides 12 are provided beneath each hammercrusher and the unit forming the basket 5 may be moved on such guides.In the driven-in state the basket 5 extends on both sides of a verticalplane passing through the axis of rotation of the rotor 2 and bears withits front end 13 on a stationary abutment 14, the rails 15 being raisedslightly from the roller guides 12 (thus relieving the latter from thegrinding pressure). The upper (inner) edge of each grating basketadjacent the associated plate 6 lies slightly lower than the lower edgeof the hammers 3.

The arrangement is however such that the basket 5 may be moved to oneside only of the vertical plane through the axis of the rotor, i.e.,withdrawn from the crusher housing in the horizontal direction, andwithout appreciable lowering. The basket 5 is lowered at the beginningof this horizontal movement only by a few millimeters until the rails 15bear on the roller guides 12. Correspondingly, at the end of theinsertion movement the basket 5 is raised slightly when it is introducedby an inclined face into the abutment 14.

When the basket 5 is withdrawn the grating plate 6 remains in thecrusher housing and can then be separately replaced if necessary.

What is claimed is:

1. Hammer crusher apparatus comprising a housing; at least one rotorjournaled in said housing for rotation about an axis; hammers carried bysaid rotor for movement in a rotary path;.anvil means fixed in saidhousing adjacent said path; grating means arranged in an are adjacentsaid path; carriage means supporting said grating means for movementrelative to said rotor substantially horizontally without appreciablelowering from a first position within said housing and extending on bothsides of a vertical plane passing through said axis to a second positionin which said grating means is wholly on one side of said plane; and afixed grating carried by said housing in a position to form a bridgebetween said anvil means and said grating means.

2. Apparatus according to claim 1 including abutment means engageable bysaid carriage means to provide vertical support therefor when saidcarriage means is in said first position.

3. Apparatus according to claim 2 wherein said abutment means includesan inclined surface engageable by said carriage means.

4. Apparatus according to claim 1 including roller means supporting saidcarriage means for such movement.

5. Apparatus according to claim 1 including a second rotor journaled insaid housing and having hammers carried thereby, said anvil means beingcommon to both of said rotors.

6. Apparatus according to claim 5 including second grating means andsecond carriage means corresponding to the first-mentioned grating meansand carriage means, respectively, said second carriage means also beingmovable substantially horizontally without appreciable lowering betweenfirst and second positions corresponding respectively to the first andsecond positions of said first-mentioned carriage means.

7. Apparatus according to claim 1 including roller means for supportingsaid carriage means during such movement thereof, and abutment meansengageable by said carriage means to provide vertical support thereforwhen said carriage means is in said first position and relieve saidroller means of the support of said carriage means.

1. Hammer crusher apparatus comprising a housing; at least one rotorjournaled in said housing for rotation about an axis; hammers carried bysaid rotor for movement in a rotary path; anvil means fixed in saidhousing adjacent said path; grating means arranged in an arc adjacentsaid path; carriage means supporting said grating means for movementrelative to said rotor substantially horizontally without appreciablelowering from a first position within said housing and extending on bothsides of a vertical plane passing through said axis to a second positionin which said grating means is wholly on one side of said plane; and afixed grating carried by said housing in a position to form a bridgebetween said anvil means and said grating means.
 2. Apparatus accordingto claim 1 including abutment means engageable by said carriage means toprovide vertical support therefor when said carriage means is in saidfirst position.
 3. Apparatus according to claim 2 wherein said abutmentmeans includes an inclined surface engageable by said carriage means. 4.Apparatus according to claim 1 including roller means supporting saidcarriage means for such movement.
 5. Apparatus according to claim 1including a second rotor journaled in said housing and having hammerscarried thereby, said anvil means being common to both of said rotors.6. Apparatus according to claim 5 including second grating means andsecond carriage means corresponding to the first-mentioned grating meansand carriage means, respectively, said second carriage means also beingmovable substantially horizontally without appreciable lowering betweenfirst and second positions corresponding respectively to the first andsecond positions of said first-mentioned carriage means.
 7. Apparatusaccording to claim 1 including roller means for supporting said carriagemeans during such movement thereof, and abutment means engageable bysaid carriage means to provide vertical support therefor when saidcarriage means is in said first position and relieve said roller meansof the support of said carriage means.